What was found
DURING CLIMBOUT, THE CABIN FILLED WITH SMOKE AND THE RIGHT PACK DUCT TEMP WAS INDICATING ABOUT 150 DEGREES. CREW DECLARED AN EMERGENCY AND RETURNED TO MSP AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE RIGHT TEMP CONTROL VALVE AND THE CABIN TEMPERATURE CONTROL AMPLIFIER. REPLACED THE WATER SEPARATOR BAGS AND DID A HIGH POWER RUN TO CLEAR ANY RESIDUAL OIL. A CONFIRMED SOURCE OF THE SMOKE WAS NEVER IDENTIFIED. THE AIRCRAFT HAS BEEN CLEARED FOR RETURN TO SERVICE.